TM 10-1670-287-23&P 0002 00 0002 00-5 2. Main Deployment System. The main deployment system consists of the items shown below. The pilot chute has a 7-inch diameter crown, a 32-inch spiral spring, and is covered with a combination of Type I nylon cloth (0 to 5 cfm) and nylon mesh fabric. A 1-inch loop at the bottom of the main pilot chute is used to connect a 62-inch main pilot chute bridle line into the main canopy. The deployment bag measures 17 by 10-inches and is constructed of nylon cloth. A grommet in the top of the bag allows the bridle line to pass through the bag and attach to the canopy. The bag has attachment points for type II heavy-duty retainer bands, which are used to lock the bag closed and stow the suspension lines. 3. Main Canopy Assembly. The main canopy assembly consists of a rectangular canopy constructed of Type I nylon with heat set, stabilized, braided polyester suspension and control lines, a slider for reefing, and four barrel-nut style connector links for connection to the main risers. a. Canopy. The MC-4 canopy is a semi rigid wing when inflated. It has an upper and lower surface connected by a series of ribs. This construction forms a rectangular shaped canopy with seven dual openings at the leading edge known as cells. Each cell is identified numerically, 1 through 7. The cells allow ram air pressure between upper and lower surfaces giving the canopy its shape and glide characteristics. MAIN PILOT CHUTE MAIN PILOT CHUTE BRIDLE AND DEPLOYMENT BAG Ring NO. 5 Grommet Suspension Line Attaching PointsLocking Stow Attaching Points Locking Flap